FindBugs uses static analysis to look for bugs in Java code. it can analyze programs compiled for any version of Java. Eclipse and Maven plugins are available. FindBugs has been downloaded more than 700,000 times.

FindBugs - Static Analysis Tool for Java

JMeter is a pure Java desktop application designed to load test functional behavior and measure performance. It may be used to test performance both on static and dynamic resources (files, Servlets, Perl scripts, Java Objects, Data Bases and Queries, FTP Servers and more). It can be used to simulate a heavy load on a server, network or object to test its strength or to analyze overall performance under different load types. 

 It could do performance test for Web application, Web services, Database, LDAP, JMS, Mail. It produces graphical analysis of test report. Test results could be cached offline. Data analysis and visualization plugins allow great extensibility.

JMeter is a pure Java desktop application designed to load test functional behavior and measure performance. It may be used to test performance both on static and dynamic resources (files, Servlets, Perl scripts, Java Objects, Data Bases and Queries, FTP Servers and more). It can be used to simulate a heavy load on a server, network or object to test its strength or to analyze overall performance under different load types.

JMeter - Load and Performance tester

SonarQube is the open source platform for continuous inspection of code quality. SonarQube provides the capability to not only show health of an application but also to highlight issues newly introduced. With a Quality Gate in place, you can fix the leak and therefore improve code quality systematically. Code analyzers can detect tricky issues such as null-pointers dereferences, logic errors, resource leaks.

Sonarqube - Continuous Code Quality

Sonar is an open platform to manage code quality. As such, it covers the 7 axes of code quality: Design, Code duplication, Unit test, Code complexity, Potential bugs, Coding rules, Comments. It has support for multiple languages like .NET, PHP, Java etc. 

 Sonar has more than 600 coding rules, provides standard metrics like Lines of Code, Cyclomatic Complexity, Duplicated code. It provides code coverage results for associated Unit test. It has hosted online metrics for open source projets <A HREF="http://nemo.sonarsource.org/" target="_blank">http://nemo.sonarsource.org/</A>.

Sonar is an open platform to manage code quality. As such, it covers the 7 axes of code quality: Design, Code duplication, Unit test, Code complexity, Potential bugs, Coding rules, Comments. It has support for multiple languages like .NET, PHP, Java etc.

Sonar - Code quality for all languages

Adds static typing to JavaScript to improve developer productivity and code quality.

Flow - A static type checker for JavaScript

PMD is a source code analyzer. It finds common programming flaws like unused variables, empty catch blocks, unnecessary object creation, and so forth. It supports Java, JavaScript, Salesforce.com Apex and Visualforce, PLSQL, Apache Velocity, XML, XSL.
 
Additionally it includes CPD, the copy-paste-detector. CPD finds duplicated code in Java, C, C++, C#, Groovy, PHP, Ruby, Fortran, JavaScript, PLSQL, Apache Velocity, Scala, Objective C, Matlab, Python, Go, Swift and Salesforce.com Apex and Visualforce.

PMD is a source code analyzer. It finds common programming flaws like unused variables, empty catch blocks, unnecessary object creation, and so forth. It supports Java, JavaScript, Salesforce.com Apex and Visualforce, PLSQL, Apache Velocity, XML, XSL.

PMD - An extensible cross-language static code analyzer

The Panopticode project provides a set of open source tools for gathering, correlating, and displaying code metrics. It evaluates software quality and ensures coding standards. It installs and configures set of tools like Emma or Cobertura for unit test code coverage, Checkstyle to validate the coding standards, JDepend to check the dependency, JavaNCSS for Cyclomatic Complexity metrics. Each tool represents its data in a proprietary format. Panopticode correlates data from different tools. It generates a report with metrics, historic data with poerful visualizations. Source Location: <A HREF="http://sourceforge.net/projects/panopticode/" target="_blank">http://sourceforge.net/projects/panopticode/</A>

The Panopticode project provides a set of open source tools for gathering, correlating, and displaying code metrics. It evaluates software quality and ensures coding standards. It installs and configures set of tools like Emma or Cobertura for unit test code coverage, Checkstyle to validate the coding standards, JDepend to check the dependency, JavaNCSS for Cyclomatic Complexity metrics.

Panopticode - Gathers, Correlats, and displays code metrics

The Grinder is a Java load testing framework that makes it easy to run a distributed test using many load injector machines. Load test anything that has a Java API. This includes common cases such as HTTP web servers, SOAP and REST web services, and application servers (CORBA, RMI, JMS, EJBs), as well as custom protocols. 

 A graphical console allows multiple load injectors to be monitored and controlled, and provides centralised script editing and distribution. Automatic management of client connections and cookies. SSL. Proxy aware. Connection throttling. 

 The Grinder can simulate web browsers and other devices that use HTTP, and HTTPS. It can be used to test Web Service, Database, RPC, POP3, SMTP, FTP, and LDAP.

The Grinder is a Java load testing framework that makes it easy to run a distributed test using many load injector machines. Load test anything that has a Java API. This includes common cases such as HTTP web servers, SOAP and REST web services, and application servers (CORBA, RMI, JMS, EJBs), as well as custom protocols.

Grinder - Java Load Testing Framework

JSHint is a community-driven tool to detect errors in JavaScript code and enforce your team's coding conventions.

JSHint - A Static Code Analysis Tool for JavaScript 

Checkstyle is a tool to help programmers write Java code that adheres to a coding standard. Checkstyle is highly configurable and can be made to support almost any coding standard. Checkstyle provides checks that find class design problems, duplicate code, or bug patterns like double checked locking. This tool could be integrated as Ant task. Plugins are available for Eclipse, Netbeans, QALab, Emacs etc.

Checkstyle is a tool to help programmers write Java code that adheres to a coding standard. Checkstyle is highly configurable and can be made to support almost any coding standard. Checkstyle provides checks that find class design problems, duplicate code, or bug patterns like double checked locking. This tool could be integrated as Ant task.

Checkstyle - Checks Java coding standard

Cobertura is a Java tool that calculates the percentage of code accessed by tests. It can be used to identify which parts of your Java program are lacking test coverage. it instruments Java bytecode after it has been compiled. Reports are generated in HTML and XML. It shows cyclomatic code complexity of each class, and the average cyclomatic code complexity for each package and for the overall product. This tool can be executed from Ant or from command line. Appfuse and other popular projects are using this tool. This tool is based on jcoverage.

Cobertura is a Java tool that calculates the percentage of code accessed by tests. It can be used to identify which parts of your Java program are lacking test coverage. it instruments Java bytecode after it has been compiled. Reports are generated in HTML and XML. It shows cyclomatic code complexity of each class, and the average cyclomatic code complexity for each package and for the overall product.

Cobertura - Code coverage tool

Pylot is a free open source tool for testing performance and scalability of web services. It runs HTTP load tests, which are useful for capacity planning, benchmarking, analysis, and system tuning. Pylot generates concurrent load (HTTP Requests), verifies server responses, and produces reports with metrics. Tests suites are executed and monitored from a GUI or shell/console. 

 It supports HTTP and HTTPS. It is multi-threaded and generates real time stats. Response is verified with regular expressions. GUI and Console mode support available.

Pylot is a free open source tool for testing performance and scalability of web services. It runs HTTP load tests, which are useful for capacity planning, benchmarking, analysis, and system tuning. Pylot generates concurrent load (HTTP Requests), verifies server responses, and produces reports with metrics. Tests suites are executed and monitored from a GUI or shell/console.

Pylot - Performance & Scalability Testing of Web Services

Catch common Java mistakes as compile-time errors

Error Prone - Catch common Java mistakes as compile-time errors

JSLint is a JavaScript program that looks for problems in JavaScript programs. It is a code quality tool. JSLint takes a JavaScript source and scans it. If it finds a problem, it returns a message describing the problem and an approximate location within the source. The problem is not necessarily a syntax error, although it often is. JSLint looks at some style conventions as well as structural problems. It does not prove that your program is correct. JavaScript is a young-for-its-age language. It was originally intended to do small tasks in webpages, tasks for which Java was too heavy and clumsy. But JavaScript is a very capable language, and it is now being used in larger projects. Many of the features that were intended to make the language easy to use are troublesome for larger projects. A lint for JavaScript is needed: JSLint, a JavaScript syntax checker and validator. The source is available in location <A HREF="http://www.jslint.com/lint.html" target="_blank">http://www.jslint.com/lint.html</A>

JSLint is a JavaScript program that looks for problems in JavaScript programs. It is a code quality tool. JSLint takes a JavaScript source and scans it. If it finds a problem, it returns a message describing the problem and an approximate location within the source. The problem is not necessarily a syntax error, although it often is. JSLint looks at some style conventions as well as structural problems. It does not prove that your program is correct.

JSLint - The JavaScript Code Quality Tool

EMMA is an open-source toolkit for measuring and reporting Java code coverage. EMMA can instrument classes for coverage either offline (before they are loaded) or on the fly (using an instrumenting application classloader). The coverage stats are aggregated at method, class, package, and "all classes" levels. EMMA can instrument individial class files or entire jars. It outputs the report in the form of plain text, HTML, XML.

EMMA is an open-source toolkit for measuring and reporting Java code coverage. EMMA can instrument classes for coverage either offline (before they are loaded) or on the fly (using an instrumenting application classloader). The coverage stats are aggregated at method, class, package, and "all classes" levels. EMMA can instrument individial class files or entire jars.

EMMA Java code coverage tool

Discover open source projects across all platforms

Projects